Blindstitch sewing-machine.



BLINDSTITGH SEWING MACHINE.

APPLICATION FILED 001 23. 1902.

N0 MODEL.

wva'v woz John G. Lewis mwN ON a E m mi UNITED STATES} Patented June 23,190a.

PATENT OFFICE.

JOHN G. LEWIS, OF ST. LOUIS, MISSOURI.

BLINDISTITCH SEWING-MACHINE."

SPECIFICATION forming part of Letters Patent N 0. 731,696, dated June23,1903.

Application filed October 23, 1992. Serial No. 128,427. on model.)

To all whom it may concern:

Beit known that 1, JOHN G. LEWIS, a citi-l zen of the United States,residing at the city I of St. Louis,in the State of Missouri, haveinvented a certain new and useful Sewing-Ma chine, of which thefollowing is such a. full, clear, and exact description as will enableany one skilled in the art to which it appertains to parts to recedelaterally from the other after a shaft 16.

the point of the needle has entered the goods.

In the accompanying drawings, Figure 1 is a side view, partly in sectionand partly in elevation, showing a portion of a sewing-machine embodyingthe preferred form of my invention. Fig. 2 is a section on the line 2 2of Fig. 1. Fig. 3 is a top plan view of the needle-bar and bearing shownin Fig. 1. Fig. 4 is a top plan View of a portion of the machineembodying a modified form, and Fig. 5 is a detail view of a portion ofthe mechanism shown in Fig. 4.

Like marks of reference refer to similar parts in the several views ofthe drawings.

10 is a back guide around which the goods are adapted to be held andwhich in the preferred form of my invention is preferably made normallystationary.

'11 is a needle-bar carrying a needle 12. The needle12 is mounted in theneedle-bar 11 eccentrically, as shown in Fig. 3, and is preferably heldin position by means of a setscrew 13. The needle-bar 11 reciprocateslongitudinally in bearings 14 and 15, carried by The shaft 16 ispreferably arranged to oscillate on its axis, so as to form l tial to myinvention.

an overseaming stitch; but this is not essen- In the needle-bar 11 isformed a longitudinal slot or groove 18,

a roller 21, as shown inFig. 2.

having an inclined portion 19. Projecting through the bearing 14 andintothe slot 18 is a screw 20, which ispreferably provided with Theneedlebar 11 is reciprocated longitudinally by a bar 22, secured to ashort collar 23 on the said needle bar 11. The collar 23 is looselymounted on the needle-bar 11, so as to allow the said needle-bar torotate, and is prevented from moving longitudinally on the bar by meansof fixed collars 24. I

In the operation of my machine the needlebar 11 is moved upwardlybymeansof the bar 22, and as the point of the needle 12 enters the goods foldedaround the back guide 10 the inclined portion 19 of the slot 18 comes incontact with the roller 21 and causes the needle-bar 11 to rotatethrough a slight angle on its axis. On account of the eccentric positionof the needle 12 it is thrown away from the back guide 10, thuspreventing the eularged portion of the needle from striking against theback guide and coming through the goods.

In the modification shown in Fig. 4 the needle 12 is preferably mountedin the center of the needle-bar 11 in the usual manner, and in place ofcausing the needle to recede from the back guide I cause the back guideto recede from the needle. In this form of my machine the back guide 10is preferably carried by an arm 26, pivotallymounted at a point 27 to anarm 28 0f the machine.

Mounted on the main shaft 29 of the machine,

which is preferably contained in a housing 30, is a cam 31. In the cam31 is formed a guideway 32, in which runs a stud or roller 33, carriedon a bifurcated arm 34. The bifurcated arm 34 embraces the main shaft atone end, and at the other is pivoted to the arm 26, carrying the backguide 10. In this form of my 7 machine the inclined portion of theguideway 32 comes in contact with the stud or roller 33 as the point -ofthe needle enters the goods around the back guide, and thus draws theend of the arm 26 toward the housing 30. This causes the back guide 10to recede from the needle 12 and accomplishes the same result as themechanism shown in Fig. l.

I am aware that blindstitching-machines have been heretofore made inwhichan oscillating former was used to bend leather or longitudinally,and means for causing one of said parts to recede laterally from theother after the point ofthe needle has entered the goods. g

2. In a sewing machine, a back guide around which the goods are adaptedto be held, a needle cooperating with said back guide, means forreciprocating said needle longitudinally, and means for causing saidneedle to recede laterally from said back guide after its point hasentered the material.

3. In a sewing machine, a back guide around which the goods are adaptedto be held, a needle-bar, a needle mounted eccentrically in saidneedle-bar and adapted to cooperate with said back guide, and means forrotating said needle-bar to cause said needle to recede laterally fromsaid back guide after its point has entered the material.

4. In a sewing. machine, a back guide around which the goods are adaptedto be held, a needle bar, a needle eccentrically mounted in saidneedle-bar and adapted to cooperate with said back guide, and means forrotating said needle-bar at each stroke to cause said needle to recedelaterally from said back guide after its point has entered the material.

5. In a sewing machine, a back guide around which the goods are adaptedto be held, a needle-bar carrying a needle eccentrically mountedtherein, a guide for said needle-bar, a slot extending longitudinally ofsaid needle-bar and having an inclined portion, and a stud or rollerrunning in said slot and adapted to rotate said needle-bar to throwsaidneedle away from said back guide.

In testimony whereof I have hereunto set my hand andaffixed my sealinthe presence of two subscribing witnesses.

JOHN G. LEWIS. [L. s.]

Witnesses:

L. B. BEACH, JAMES H. BRYsoN.

